Electric-current transformer.



U. LE G. FORTESGUE.

ELECTRIC CURRENT TRANSFORMER. APPLIUATION FILED 001.8, 1910. nmmwnn AUG. zo, 1914.

1,129,472. i Patented 11u15/33,1915.

2 SHEETS-SHEET 1.

' ATTORNEY C. LE G. FORTESCUB.

ELECTRIC CURRENT TRANSFOEMER.

E APPLIUATION FILED 00T. a, 1910. RBNEWBD AUG. zo, 191.4. 1 ,1 29,472.

Patented Feb. 23, 1915.

2 SHEETS-SHEET 2.

i a C QNTOR WITNESSES i ATTORNEY l lar to'tht c a ofthe coils" are' graded according to theV available space within the. coreq'member.

` UNITED STATES PATENT oEEIcE- CHARLES LE e. EoRTEscUE, or EITTsEnEGH, PENNSYLVANIA, Ass'rGNoE To wEsT- INeHoUsE ELECTRIC JaNn EiAimEAc'rUEING COMPANY, A ycon?o-nA'rIoN or EENNSYLVANIA.

ELECTRIC-CURRENT TRNSFORMER.

Speccation of Letters Patent;

rammed 1re-,11.123, 1915.

Original application led Agustf, 1%9, Serial No. 510,854. Divided and this applcationiled October 8,

1910,- Seral No. 586,097. Renewed August 20, 1914. Serial No. 857,772. l

T0 all 'whom t may concern Be it known that I, CHARLES LE G. Fon- TEscUE, a'. subject of the King of Great Britain, and a resident of Pittsburgh, in the county of Allegheny and State of llennsyl-f VVania, have invented a. new and useful linprovement in Electric-'Current rl'rransformers, of which the following is a specification,

lthis application being a division of application, Serial No. 510,854, filed August 9., 1909.

My invention relates to transformers and particularly to the windings and insulation of such transformers as are adapted for very high-voltage service.

The object of my invention is to provide a winding which shall require a very small amount of insulation, relative to the vvoltage of the transformer, with a view to reducing the space occupied by 'the insulation and thev manufacturing cost of the transformer.

Figure 1 of the accompanying drawings is a partially sectional view of a transformer having its winding divided into four groups of coils which are distributed on the four legs of a substantially square or rectangular core member. Fig. 2 is a view, corresponding to Fig. 1, of a modified structure', in which the high-potential winding is so dis'- tributed and the lengths of the coils are so proportioned as to occupy practically the entire space Within the'core member.` Q

Referring to the drawings, the structure here shown comprises a. substantially .square or rectangular'core memberl, provided with a plurality of similar groups 2, 3, 4 and 5, of low-voltage coils, and groups 6, 7 .8 and 9 of relatively high voltage coils whichsurround the respective legs 10, 11, 12 and 13 ofthe corememb'er and are separated therefrom by insulating Vsleeves 14, the high and v low-voltage groups being separated fromeach other by insulating sleevesfl.

l The low-voltage coils'may be connected in any suitable rua-nner. Assuming that aterminal 16 of coil 17 is connected toa high-voltage Y circuit conductor, circuit isvcontinuedY from I this coil, through coils 18 toi36, inclusive,` as clearly shown in Fig. 1 of the drawings.

The arrangement shown in Fig. 2 is the lengths Fig. '1,' except that The coils are asin' Fig; 1, and

' is evident that the coils of highest potential are farthest from the 'core member, the terconnected to ground. Y

rihe .amount of space occupied by the insulation may be very small, relative to the voltages with which the transformer is intended for use. Y

Structural modications may be eifected within the spirit and scope of my inventionv and I do not wish to be limited to the arrangements shown in the drawings.

l claim as my invention:

1.- A. transformer comprising a substantially square core member and four groups of substantially concentric coils disposed on the respective legs of the core, said coils being connected in a series of which the outer coils of' all groups are at one en'd and the central coils of all groups are-at the otherl 2. A transformer comprising a substantially square core member and four similar groups of substantially concentric coils mounted on therespective legs of thel core, said coils being connected in series from the coil of largest diameter. of one group,

3. A transformer comprising a substan- I tially rectangular core member, a Winding comprising four groups of concentric coils disposed on the separate legs of the core and Vgraded in length to occupy a maximum amount of Vspace Within the core, the coils of the several groups being ina series of which the outer coils "of all groups arel at one end and the central coils of all groups are at the other end to effect a maximum separation between the highpotential. portion of the winding and the core.

4. lA11 electricaldevice comprising a plural legged core member, of a group of substantially concentric coils upon each core leg, the ,said coils being connected in a series several groups. are connected `in immediate adjacent coils o the same'group.

1nA which the corresponding coils of the 5. An electzica device comprising a plu- In testimony whereof, have hereunto ral legged core memcer, of a group of coils subscribed my neme this 23rd day of Sept. 10 upon each core leg, the seid coils being con- 1910.

nected in a series in woh the corresponding cois of the several groups are connected CHARLES LE G' FORTESCUE' in immediate succession and one coil of each f W tnesses:

of the other groups '1s interposed in the series Y 'HELEN BUXTON,

between adjacentcoils 0I the same group. -f B. B. HlNEs. 

